MD Settings: Add missing cr-hidden-style in settings_subpage_search.html.

chrome/browser/resources/settings/settings_page/settings_subpage_search.html

Index: chrome/browser/resources/settings/settings_page/settings_subpage_search.html
diff --git a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
index c3aacac5b94678c9b27753da82381c882654b69e..7b88464a0e5a1cb3515a6b5b8d08401ed4ad4822 100644
--- a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
+++ b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
@@ -1,4 +1,5 @@
 <link rel="import" href="chrome://resources/cr_elements/cr_search_field/cr_search_field_behavior.html">
+<link rel="import" href="chrome://resources/cr_elements/hidden_style_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
@@ -7,7 +8,7 @@
 
 <dom-module id="settings-subpage-search">
   <template>
-    <style>
+    <style include="cr-hidden-style">
       :host {
         --subpage-search-underline: {
           margin-bottom: -2px;